Plant grows in bricks, likes green car

This little fella has sprouted up in the car park, in the space next to a Toyota Prius... I don't think this is a coincidence. I can see no other plants in the car park. Conclusive evidence, therefore, that the Toyota Prius is improving the environment.

(For the record, I think hybrid cars are a good idea, and this is in no way intended to sarcastically cast doubt on the Prius. Shame it's ugly though.)